Finding the Fourth Proportional to 8,911.39, 12,300.46 and 5,137.08

Step by Step Solution

1. Step 1: Write the proportion equation
   8,911.39 : 12,300.46 = 5,137.08 : x
2. Step 2: Convert to fraction form
   8,911.39/12,300.46 = 5,137.08/x
3. Step 3: Cross multiply
   8,911.39x = 12,300.46 × 5,137.08
4. Step 4: Simplify right side
   8,911.39x = 63,188,434.21
5. Step 5: Solve for x
   x = 63,188,434.21/8,911.39
6. Step 6: Final answer
   x = 7,090.75